# iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j REDIRECT --to 127.0.0.1:8880

# iptables -A FORWARD -p tcp -i eth0 --dport 80 -j ACCEPT

Port 80
Upstream localhost:8880

# Allow 127.0.0.1

<VirtualHost thisdomain.com:8880>
DocumentRoot /www/docs/svn/myapp
ServerName thisdomain.com
</VirtualHost